共轴法立体视觉三维测量的研究

提出一种新的立体视觉三维测量的双目布局方案——共轴法，推导了共轴情况下空间点和图像投影的对应关系及其外极线方程。与其他双目布局方案相比，具有匹配运算量少、共极性线方程简单等优点。     

微波辐射法干燥锡酸钠新工艺

研究了利用微波辐射干燥锡酸钠的新工艺，并对影响锡酸钠脱水率的微波功率、微波辐射时间、物料重量、物料厚度等各种因素进行了分析和讨论。实验结果表明利用微波辐射干燥锡酸钠新工艺是可行的，且微波干燥锡酸钠的脱水率与干燥的物料重量、辐射时间、微波功率和物料厚度等因素有关。     

钛酸锶压敏陶瓷及其性能影响因素

为了提高SrTi03压敏陶瓷的性能，对其影响性能的因素进行了论述，指出主要影响因素是配方体系及制造工艺中的绕结工艺，并指出改善SrTi03综合性能的途径是进一步提高瓷料配方的适应能力并完善制造工艺。     

硫化铜矿石浮选捕收剂的研究进展

本文对常用的和新型的硫化铜矿石浮选捕收剂进行了评述,认为要综合回收硫化铜矿石中铜、金、银、硫等有益元素,必须采用铜硫低碱度浮选分离工艺,并选用对硫化铁矿物有好的选择性并对硫化铜矿物具有较强亲固能力的捕收剂。     

Solution of a hollow thick-wall cylinder subject to quadric function pressures and its limit when l→∞

Analytical solution of basic equations in any discipline, especially in engineering science, is important. The solution of a hollow thick-wall cylinder subject to variable pressures, which is in fact a solution to the spatial symmetric problem, has found wide applications[1]. But the pressure is not always distributed uniformly in engineering prac-tice. So it is very significant to get the solution of arbitrarily distributed pressures. Among various functions, the multinomial function is most …     

Influence of hydrogen content on the behavior of grain reflnement in hypereutectic aluminum-silicon alloy

Dissolved hydrogen is harmful to mechanical properties of refined hypereutectic aluminum-silicon alloys. In the present work, by using a stepped-form mold and the hydrogen-detecting instrument HYSCANⅡ, the relationship between the initial hydrogen content in the melt and the refinement effect on the casting of hypereutectic aluminum-silicon alloy was investigated. The experimental results show that the cooling rate, the hydrogen content and the grain refinement effect are three interactive factors. When the hydrogen content is above 0.20 mL/100 g and the cooling rate is lower than that in 50 mm-thick step, hydrogen dissolved in the alloy melt influences the grain refinement effect. With increasing the cooling rate, the critical hydrogen content increases too. It is expected that much hydrogen in the melt make the net interfacial energy larger than or equal to zero, resulting in the shielding of the particles A1P during solidification and that the critical gas content is closely related to the critical     

PIV测试水轮机尾水管锥管流场

介绍了PIV(ParticleImageDisplacementVelocimetry ,简称PIV)的工作原理 ,以尾水管为研究对象 ,采用PIV技术详细测量了在某些工况下尾水管的内部流场 ,给出了观测面的测量结果。     

Preparation and crystallization control of nanoparticle hydroxyapatlte

Nanoparticle hydroxyapatite was prepared by a wet chemical precipitation method. The effects of different synthesis conditions, i.e. contents of reagents (0.2, 0.5 and 0.8 mol/L), reaction temperatures (20, 37, 55 and 75℃) and reaction time (0-24 h), were studied based on crystallization process analysis and the effects of washing methods (with water or alcohol) were also studied. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED) and inductively coupled plasma spectroscopy (ICP) were used to characterize the powders. Chemical analysis shows that the purity of the precipitated hydroxyapatite largely depends on reaction time. X-ray diffraction and TEM micrographs results show that reaction temperature is a key factor affecting crystallinity, morphology and particle size. Degree of supersaturation and stirring also affects the crystallization. Particles are in a shape of short rod and have a size of 20-40 nm in lengt     

One-dimensional nano-structure of Cu-Zn-Al alloy

Cu-Zn-Al alloy of one dimensional nano-structure was prepared and the structure of obtained nano-material was characterized by transmission electron microscope (TEM). It was shown that there are non-linear oscillations on the surface of Cu-Zn-Al alloy and the consanguineous connection exists between non-linear oscillation and the growth process of one dimensional nano-structure. The diameter of one dimensional nano-structure is about 40 nm, and the ratio of length to diameter is over 40. Finally, the growth mechanism of one dimensional nano-structure was also studied.     

Tridimensional Treatment Planning and Rapid Prototyping for Maxillofacial Prosthesis

1　IntroductionThesuccessofmostmaxillofacialsurgerydependsoncarefulanalysisandplanningbasedonavarietyofdiag nosticinformationsuchasphotographs ,radiographsandarticulateddentalmodels .Intheconventionalcephalo metricX raytreatmentplanning ,thesurgicalprocedureisvisualizedinthemid sagittalplane .Ifthepatientshaveasymmetricdeformities ,projectionofthefacialanatomyonthemid sagittalplanedoesnotprovideadequateevalu ationandplanning ,whichmakesthetherapeuticdecisiondifficult .Thisisthereasonwhymany 3…